Improvement in machines for jointing oval frames



Unirse STATES" PATENT..

DAVID GrARRISON,` OF PHILADELPHIA, PENNSYLVANIA.

Specification forming part of Letters Patent No. 54,590, dated May 22, 1866.

To all whom it may concern:

Beit known that I, DAVID GARRIsoN, ot' the city of Philadelphia, in the county of PhiL adelphia and State of Pennsylvania, have invented a new and useful Improvement in Machinery for J ointing Sections ot' Ovals; and I do hereby declare that the following is a full, clear, and exact description of the same, reterencc being had to the accompanying drawings, forming part of this specification, in which- Figure lis a plan view ot' a machine constructed according to my invention. Fig. 2 is an elevation of the same, looking in the direc tion of the arrow shown in Fig. l. Fig. '3 represents a plan view of one of the sections ot' an oval, illustrating the mode ofjointing it by my improved machinery.

Similar letters of reference indicate corresponding parts in the several tigures.

My invention is more especially applicable to the manufacture of oval frames'ot' wood.

Its object is to cut the joints of sect-ions of ovals or ellipses in such manner that when several sections are put together they `will form a true ellipse.

The sections are iirst cut out by any suitable means in the proper curved form, but somewhat larger than is necessary `to form the desired section of the ellipse, as represented in Fig. 3 ot' the drawings, and the two ends it' are then cut off ata proper anglel with each other by my invention, as indicated by the lines a' and y in that iigure, to form thejoints.

The invention consists in the employment of two saws arranged so that their cutting-planes are at the proper angle to each other, and a table the face of which is perpendicular to said cutting-planes and which has a movement parallel with said planes, and upon which the sections are laid in contact with suitable adjustable guides or stops, and thereby enabled to be presented in a proper manner to the action oi' the saws.

My invention admits of considerable variation in the arrangement of its details; but to enable others skilled in the art to make and use it, I will proceed to describe it in itssimplest form with reference to the drawings.

A is a horizontal frame, on the top of which are arranged the bearings a a a a', for the reception ot' the journals of the rotary spindles B 13 of the two circular saws C C', the axes of the said spindles being arranged in the same plane and at right angles to each other, and being furnished with pulleys b b', for the reception of driving-bands for producing the rotary motion of the saws.

D is a horizontal quadrant-shaped table attached securely to an upright pillar, E, of square or such other form that it mayslide up and down freely, without turning, in right guides f f, constructed in or secured to theV frame A. To this table, or its pillar E, there is applied a spring, F, or a weighted cord running over pulleys, for the purpose of raising the said table up above the saws, as shown in Fig. 2. The two straight edges of this table are parallel with the planes of revolution of and nearly close to the saws.

Above the top ot' the table D there projects two adjustable stops or guides, d d', against which the quarter-sections G of the oval are placed and held by hand while beingk jointed by the saws, the said guides being so arranged that when the inner edges of the sections Gr are in cont-act with them the point of intersection of the major and minor axes of their ellipse will be situated at the point of intersec tion of the planes of revolution ot' those faces ot' the two saws which are nearest each other.

rlhe stops d. d are adjustable for the sec- `tions of ovals of different sizes and forms, and

for this purpose are iitted to two slots, c c', in the table D, the said slots being parallel with the two saws-one with one saw, and one with the other. rI he said stops are furnished with screws and nuts c c', Fig. 2, by which they are secured iirmly in place when properly adj usted.

The sole-plates H H ot1 the saw-spindle bearings'uJ a and c a are so secured by the frame A, by bolts and nuts h h', Fig. .2, as to be capable of adjustment in directions parallel with the planes of revolution of their respective saws, such adjustment being provided for by slots g g' in the frame A, through which the said bolts pass.

The operation of the machine is as follows: The sections G of the oval or ellipse having been cut by any suitable means to the proper curved form, according to the size and relative length of the major and minor axes ot' the oval or ellipse to be produced, but somewhat longer than is necessary, are placed, one or more at a time, upon the table D and against the stops or guides d d', as shown in Fig. l,

2 c sasso While the table D is elevated above the saws. When the section or sections have been so placed they may be held in position by "the handof the operator or by any other means, While the table D is depressed by hand or any suitable means, rotary motion being in the meantime given to the two saws, which are thereby caused to eut oft' the portions M of the extremities which project beyond the planes of revolution of the inner faces ot' the saws, leaving the said extremities square with each other, and making each section an exact quarter of an ellipse, terminating at one end in the major axis and at the other end in the minorf axis ofthe ellipse. When the extremities have been thus cut ott the pressure is removed from the table C, which is then raised by the spring F or its equivalent. The section or sections are then removed, and the machine is ready for a repetition of the operation.

Any four of the sections which have thus had their ends eut oft' or jointed will, when their jointed ends are put together7 form a true oval or ellipse.

It is obvious that the sections of ovals or ellipses'A may be eut by a machine of the same character as is herein described in such manner as to make thejoints come in other positions than in the major and minor axes but in such case the sections would require to be of at least two dift'erent forms, and that two the oval or ellipscs; but this would not only require different arrangements ofthe stops or guides d d', but the angle formed by the planes of revolution of the two saws would have to be varied. It will therefore be seen, as I have hereinbefore stated, the machine represented in the drawings illustrates my invention in its simplest form, and that the invention admits of considerable variation in its details.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination of' two saws the cuttingplanes of which are at an angle to each other, a table having a movement parallel with the cutting-planes of the two. saws, and a set of adjustable stops or guides arranged upon the said table in relation to each other and to the saws, substantially as and for the purpose l herein specified.

DAVID GARRISON.

Witnesses: i

HENRY It. HALL, ALFRED R. LnN'rz. 

